You can cancel by submitting a request via the Help Center.
The contract is automatically renewed for another year, if not cancelled 30 days before end of contract. Please note that the hardware devices must be returned within 4 weeks from the end of contract. If the devices are not returned the purchase price of the hardware will be charged. Up to 6 months of rental fees will be subtracted from the purchase price.
If you have time, please add a sentence to let us know why you have decided not to continue using tado°. This is very important in allowing us to develop tado° based on what our customers want.